Sorry, but that didn't help. It didn't have any instructions on what to do to get the backend admin back working. I followed the link to this page: https://github.com/joomla/joomla-cms/pull/2519 but that is a fix for the upgrade/installed. I need a fix for a site that has used the upgrader and broke.

I have a about 10 sites that were all started from the site I am trying to upgrade, so I need a fix or I have a whole lot of sites that can't be upgraded.

For anyone else that has this issue, here are the instructions to get your site back working from Nicholas Dionysopoulos:

You have tried to install a very old FOF-based component which was designed for Joomla! 1.5 only. This screwed up your installation. You should be able to easily fix it by doing the following steps in the order specified:

1. Delete the libraries/fof directory from your site 2. Download FOF 2.1.1 3. Extract the ZIP file locally 4. Upload the fof directory you extracted into your site's libraries directory Assuming that the older component you installed isn't using a private copy of FOF 1.x and loading it via a plugin you should get access to your site. Otherwise you will have to determine which plugin is trying to load the very old FOF version and delete it from your site.

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